JPH0417882A - Stem-winding button sewing machine - Google Patents

Abstract

PURPOSE:To attach a button firmly without fraying by a method wherein a regular sewing mechanism, which forms stitches with needle thread and bobbin thread, is provided as a sewing device which perform stern sewing and stem winding work. CONSTITUTION:Not only thread-stem sewing work but also stem winding work are performed by a regular sewing mechanism which forms stitches with needle tread and bobbin thread. With a button 151 held above a crease of a fabric 143 by a button holder 79, a sewing needle 45 is inserted through a button hole to perform sewing work so that a thread-stem is formed and the button 151 is attached on the fabric 153. Then, the button 151 is scooped up by a button guide 109 which is moved by a guide elevating cylinder 101. With this state kept, a guide turning cylinder 97 is put in action to turn the button guide 109 for about 90 deg. against the direction of the needle 45. After that, tire first stitch is made on the fabric 153 side (position A), then the second stitch on the button side (position B), and again on the fabric 153 side while a whole stem winding button sewing mechanism 1 is moved to the left and right and back and forth. These actions are sequentially repeated to perform regular sewing work in which stitches are formed by needle thread and bobbin thread. Finally, the final stitch is made on the fabric 153 side to form a knot (position C).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a neck-wrapping button sewing machine that performs neck-wrapping when sewing buttons onto work fabric.

[Prior Art] Conventionally, a neck-wrapping button sewing machine is equipped with a button holder that clamps the button from its outer periphery, attaches a root thread to the button with a sewing machine needle while the button is clamped by the button holder, and then attaches the root thread to the button. There was a method in which the button holder was reversed about 90' and the button was tilted with respect to the direction of the sewing machine needle, and the root thread was sewn in this state (Japanese Unexamined Patent Application Publication No. 6-117)
3-279873 (``Neck winding method and device for button sewing machine'').

[Problems to be Solved by the Invention] However, in the above-mentioned conventional neck-wrapping button attachment device,
Only the attachment of the root thread was performed using lock stitches, and the neck wrapping work was performed using a single chain stitch using only the upper thread. For this reason, there was a problem that the buttons easily frayed and the holding force of the button was weak.

An object of the present invention is to solve the problems of the conventional technology, and to realize a mechanism that can perform the root thread attachment work and the root wrapping work with a simple configuration, and to firmly attach the button without fraying. The purpose of the present invention is to provide a neck-wrapping button sewing machine capable of sewing buttons.

[Means for Solving the Problems] The sewing machine of the present invention, which has been made to solve the above problems, has the following features:
In a neck-wrapping button sewing machine that holds and tilts the button with the root thread attached and performs the neck-wrapping work on the root thread, the stitching is performed using the upper thread and bobbin thread as a sewing means for attaching the root thread and performing the neck-wrapping. It is characterized by being provided with a lockstitch mechanism that forms a lockstitch mechanism.

[Function] In the neck-wrapping button sewing machine of the present invention, the button is attached to the fabric via the root thread, the button is tilted with respect to the fabric, and the button is attached by performing root-wrapping on the root thread.

In performing this button attaching work, not only the work of attaching the root thread but also the work of wrapping the neck is performed by a lockstitch mechanism that forms a seam with the upper thread and the bobbin thread. Therefore, it is less likely to unravel compared to the neck wrapping using a single chainstitch described in the conventional technique.

[Example] Next, a preferred example of the present invention will be described in detail using the drawings.

FIG. 1 is a perspective view showing the main parts of a neck-wrapping button sewing machine as an embodiment of the present invention.

As shown in the figure, a neck wrapping button attaching device 1 is mounted on the base of the sewing machine in the front-back and left-right directions (in the figure, the direction indicated by arrow X is the forward direction, It is provided so as to be slidable in the direction indicated by y (leftward).

The main mechanism of this neck wrapping button attaching device 1 is that an upper plate 3 and a lower plate 5 are connected and fixed by a side plate 7, and a feed table 9 that can freely slide in the front, rear, right and left directions, and a feed plate 9 on the near side of the feed plate 9 A fabric guide mechanism 11 provided, a feed plate 13 fixed on the feed table 9, a presser foot lifting mechanism 19 that raises and lowers the presser foot 17 that clamps the fabric in cooperation with the feed plate 13, and a button holder that clamps the button. It is equipped with a mechanism 21 and a button guide mechanism 23 that scoops up and tilts the button, and operates each mechanism by supplying compressed air to the cylinders that constitute each mechanism in response to commands from an electronic control circuit to be described later. .

The dough guide mechanism 11 includes a dough guide back and forth movement cylinder 31 fixed to the lower plate 5 of the feed table 9, a U-shaped support member 35 fixed to the tip of a piston rod 33 of the dough guide back and forth movement cylinder 31, The fabric setting table 37 is mounted on the upper part of the support member 35. In addition,
The cylinder 31 for moving the fabric guide back and forth is moved by the movement adjustment screw 3.
By fixing the position of 9 with a fixing nut 40, the amount of movement can be adjusted.Furthermore, the fabric setting table 37 is fixed with a fastening screw 42 to the height set with a height adjusting screw 41. By being fixed, the height can be adjusted with respect to the support member 35.

According to the dough guide mechanism 11, the support member 35 and the dough setting table 37 are moved from the dough setting position (the state shown in the figure) toward the feed plate 13 by the operation of the cylinder 31 for moving the dough guide back and forth. Stops at the sewing position between the presser foot 17, that is, the operating position of the sewing machine needle 45,
After sewing is finished, return to the fabric setting position.

The presser foot lifting mechanism 19 includes a cylinder 51 for moving the presser back and forth, and a cylinder 55 for lifting the presser fixed to the tip of the piston rod 53 of the cylinder 51 for moving the presser back and forth.
The presser foot 17 is slightly moved in the front-back direction via the presser foot 17, and the presser foot 17 is raised and lowered by the operation of the presser foot lifting cylinder 55.

The button holder mechanism 21 includes a cylinder 63 for holder longitudinal movement fixed to the upper plate 3 of the feed base 9 by a fixing member 61, and a piston rod (not shown) of the cylinder 63 for holder longitudinal movement.
A holder lifting cylinder 7 is guided by a guide rod 69 fixed to the tip of the cylinder and supported by a guide bush 67.
1 and the piston rod 73 of the cylinder 71 for lifting and lowering the holder.
a connecting member 75 fixed to the tip of the connecting member 75;
The button holder 79 includes a holder support member 77 fixed to the lower end surface of the button holder 77, and a holder opening/closing mechanism 81 attached to the holder support member 77 to open and close the button holder 79.

According to the button holder mechanism 21, the button holder 79 is moved back and forth and up and down by the operation of the cylinder 63 for moving the holder back and forth and the cylinder 71 for raising and lowering the holder. That is, when attaching a button, the button holder 79 is moved to a sewing position below the sewing machine needle 45, and after sewing is completed, it is retracted to a retracted position as shown in the figure.

The holder opening/closing mechanism 81 has a link mechanism 86 that connects the tip of the piston rod 85 of the holder opening/closing cylinder 83 and the button holder 79. The button holder 79 is opened against the force of a spring (not shown).

As shown in detail in FIG. 2, the button guide mechanism 23 includes a guide lateral movement cylinder 91 fixed to the upper plate 3 of the feed table 9, and a guide connection fixed to a piston rod 93 of the guide lateral movement cylinder 91. member 95 and a guide reversing cylinder 97 fixed to the other end of the guide connecting member 95
and a support plate 99 fixed to the guide reversal cylinder 97.
a guide elevating cylinder 101 fixed to the other end of the support plate 99; and a button fixed to one end of the piston rod 103 of the guide elevating cylinder 101 via a guide attachment member 105 and having a notch 107 at its tip. Guide 1
09, and the guide mounting member 105 is fixed to the support plate 99.
The guide is provided with an upper stopper 111 and a lower stopper 113 that regulate the amount of movement of the guide by abutting the ends thereof. According to the button guide mechanism 23, the button guide 109 is moved horizontally by the guide horizontal movement cylinder 91 integrally with the guide connecting member 95, the guide reversing cylinder 97, the guide lifting cylinder 101, etc. The button guide 109 is activated by the operation of the cylinder 101.
moves upward until it abuts on the upper stopper 111, as shown by the two-dot chain line, and is further rotated by the operation of the guide reversing cylinder 97. At this time, the button guide 109 is
Since it is separated by a predetermined amount from the center of rotation of the guide reversal cylinder 97, it is reversed at a predetermined radius.

The position of the upper stopper 111 can be adjusted in the vertical direction by loosening the screw 115. By adjusting this position, the turning radius of the button guide 109 can be set as desired, and the button of the button guide 109 can be adjusted as desired. The scooping amount is determined.

The control system of the button-wrapping sewing machine configured as described above will now be described.

FIG. 3 is a block diagram showing the main parts of such a control system. As shown in the figure, the control system is equipped with an electronic control circuit 121 as its center.
1 is a well-known CPU 123° ROMI 25. RAM1
27, etc., and an input circuit 129, an output circuit 131, etc., which are connected to each other by a bus, as a logic operation circuit. The input circuit 129 is connected to a start switch 135 and a presser foot switch 137 provided near the worker's feet, and the output circuit 131 is connected to the aforementioned fabric guide mechanism 11, presser foot lifting mechanism 19,
The solenoid valves and the like of each cylinder of the button holder mechanism 21 and the button guide mechanism 23 are connected. In addition, the output circuit 131 includes stepping motors 139 and 141 that move the neck wrapping button applicator l in the front-rear direction and the left-right direction.
is connected.

The electronic control circuit 121 configured as described above executes a button attachment control process for attaching neck wrapping buttons in response to commands from the start switch 135 and presser switch 137. This will be explained along the flowchart of FIG.

First, the button attachment control process will be explained.

In FIG. 4, when the process is started, a fabric setting operation is first performed to set the fabric in a predetermined position (step 200: hereinafter, "step" will be simply referred to as r3J).

According to such dough setting work, the air chamber of the cylinder 31 for moving the dough guide back and forth is opened to the atmosphere, and the dough setting table 31 is opened to the atmosphere.
When the presser foot switch 137 is turned on after being brought into a free state where it can be moved manually,
Compressed air is supplied to the cylinder 31 for moving the fabric guide back and forth, and the cylinder 31 is operated to move the fabric setting table 37 forward, that is, toward the sewing position of the feed plate 13. When the fabric set in half is interposed between the feed plate 13 and the presser foot 17, and the presser switch 137 is stepped on, the presser foot lifting cylinder 55
is activated to press down the fabric set on the fabric setting table 37 with the presser foot 17.

Next, the button holder mechanism 21 operates the button forward/backward movement cylinder 63 to move the button holder 79 forward integrally with the button lifting cylinder 71, the connecting member 75, the holder supporting member 77, etc. to the button holding position. make it stop. In addition, in this state, the operator should insert the button into the groove of the button holder 79.
The button is manually inserted into the button holder 79 against the spring force.
Slightly spread out and set.

After the fabric setting work has been performed in this manner, the root thread attachment work for attaching the root thread to the button is then performed (S210).

According to this thread installation work, the start switch 135
When turned on, the guide left/right movement cylinder 91 is operated to move the button guide 109 to the left so that it is located below the button, and the holder lifting/lowering cylinder 7 is activated.
1 to lower the button holder 79 slightly.

In this state, a sewing operation is performed by driving the main shaft of the sewing machine, and the button is attached to the fabric with a root thread formed therein. That is, as shown in FIG. 5(a), with the button holder 79 holding the button 151 above the fold line of the fabric 153, the button 151 is sewn by passing the sewing machine needle 45 through the buttonhole. 153 with root threads formed. Thereafter, a thread cutting blade (not shown) cuts the thread from the root thread, and then the button holder 79 waits to return to its original position. After opening by the operation of 83, the cylinder 71 for raising and lowering the holder, the cylinder 63 for moving the holder back and forth, and the cylinder 83 for opening and closing the holder sequentially perform a raising operation, a retreating operation, and a closing operation.

After the root thread attaching work has been performed in this manner, a neck wrapping work for performing neck wrapping sewing on the root thread is performed (S220).

That is, as a result of the root thread attachment work, the button guide 109 below the button 151 is positioned with the root thread passing through the notch 107, as shown in FIG. 5(b). From this state, first, the button guide 109 is raised to scoop up the button 151 by operating the guide lifting cylinder 101, and furthermore, in this state, the guide reversing cylinder 97 is operated, as shown in FIG. ), the button guide 109 is reversed by approximately 90 degrees with respect to the direction of the sewing machine needle 45. By raising and reversing the button guide 109 in this manner, the root thread 157 is placed in a stretched state perpendicular to the direction of the sewing machine needle, that is, in the same direction as the fabric 153. Thereafter, root wrapping sewing is performed on the root thread.

As shown in FIG. 5(d), the neck-wrapping sewing here means that the first needle is first dropped onto the fabric 153 (position A in the figure), and the step motors 139 and 141 are driven. , move the entire neck wrap button attaching device 1 in the left-right and front-back directions, and stitch the stitches with the upper thread and bobbin thread from the second needle (position B in the figure) dropped on the button 151 side to the fabric 153 side in order. Sewing work is performed by forming a lockstitch, and finally it is dropped onto the fabric 153 side and stopped (position C in the figure).The width of the swinging of the neck wrapping thread in the left and right direction in this neck wrapping work is as follows: The step motors 139 and 141 are driven so that the setting is large on the button 151 side and narrowed towards the fabric 153 side, and as a result, it is possible to reliably perform root wrapping even on uneven root threads. .

After the neck wrapping work has been performed in this manner, post-processing work is performed (3230).

According to such post-processing work, the root-wrapping thread is trimmed using a thread cutting blade (not shown), and after the thread trimming, the guide left/right movement cylinder 91 is operated to return the button guide 109 to the right side. Thereafter, the guide reversing cylinder 97 and the guide elevating cylinder 101 are operated to rotate the button guide 109 in the horizontal direction shown in the figure in the opposite direction to the direction reversed at 5310, and to lower the button guide 109. Subsequently, the presser foot lifting cylinder 55 is operated to raise the presser foot 17. Furthermore, after opening the air chamber of the fabric guide back-and-forth movement cylinder 31 to the atmosphere and setting the fabric setting table 37 in a free state where it can be moved manually, the fabric guide back-and-forth movement cylinder 31 is operated, and the fabric setting table 37 Retract and return to the initial position.

After the post-processing work is completed in this way, the button attaching process is completed.

In the above embodiment, not only the work of attaching the root thread but also the work of wrapping the root is performed by lock stitching in which a seam is formed with the upper thread and the lower thread. Therefore, compared to the neck wrapping using a single chain stitch described in the related art, it is less likely to fray and the button can be firmly attached.

In addition, as shown in FIG. 5(d), the swing width of the root wrapping thread in the left and right direction during the root wrapping work is set large on the button 151 side, so even if the root thread is uneven, the Since the needle drop is set in the east direction of the thread (and the stitch width is set to become finer as it progresses towards the fabric side), the tied root threads can be wrapped evenly and firmly as the neck wrapping progresses.

The hook may be either a full-rotation hook or a half-rotation hook; however, if a half-rotation hook is used, it is possible to more reliably capture the needle thread loop, so it is possible to use a half-rotation hook for small stitches that require fine stitch formation. Buttons can also be securely wrapped around the neck.

[Effects of the Invention] As explained above, according to the neck-wrapping button sewing machine of the present invention, not only the root thread installation work but also the neck-wrapping work is performed by the lockstitch mechanism, so that the upper thread and lower thread Because of this, the root threads are firmly wrapped around the roots, making it difficult for the button to fray (and its holding power is great).

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of a neck wrapping button sewing machine according to an embodiment of the present invention, FIG. 2 is a perspective view showing the button guide mechanism, and FIG. 3 is a block diagram showing the main parts of the control system. Fig. 4 is a flowchart showing the button attachment control process executed by the electronic control circuit, and Figs. 5(a) to 5(d) show the main parts of the operation from thread attachment to neck wrapping. FIG. 1...Neck wrapping button attaching device 9...Feeding plate 11
... Fabric guide mechanism 17... Presser foot 19... Presser foot lifting mechanism 21... Button holder mechanism 23... Button guide mechanism 31... Cylinder for back and forth movement of fabric guide 37... Fabric setting table 79. ...Button holder 81...Holder opening/closing mechanism 97...Cylinder for reversing the guide 101...Cylinder for raising and lowering the guide 109...Button guide Fig. 2

Claims (1)

[Claims] In a neck-wrapping button sewing machine that performs neck-wrapping work on the root thread by holding and tilting the button to which the root thread is attached, an upper thread is used as a sewing means for attaching the root thread and performing the neck-wrapping. A neck-wrapping button sewing machine characterized by being equipped with a lockstitch mechanism that forms a seam with a bobbin thread.